Q101. What is the difference between aria-label and aria-labelledby?
Both give an element an accessible name, but they work differently. aria-label sets the name directly to a string, for example a button with aria-label="Close dialog". ar...
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Q102. How do you improve Largest Contentful Paint?
LCP is dominated by four factors: time to first byte, resource load time, render-blocking resources and client-side rendering delay. First ensure fast TTFB with caching, ...
Q103. How do responsive and dark-mode variants work in Tailwind?
Tailwind encodes variants as prefixes. Responsive breakpoints are mobile-first: sm, md, lg, xl and 2xl apply at that minimum width and above. ```html ... ``` That element...
Q104. What are Svelte 5 runes and how do they differ from $: statements?
Runes are compiler keywords that make reactivity explicit and also work in .svelte.js and .svelte.ts modules, not just components. $state creates a reactive value, deeply...
Q105. What are the main differences between the App Router and the Pages Router?
The Pages Router uses files under pages/. Each file exports a default component, data comes from getStaticProps, getServerSideProps or getStaticPaths, and _app and _docum...
Q106. What is the difference between ViewChild and ContentChild?
Both are query decorators, but they search different places. @ViewChild queries the component's own template, while @ContentChild queries content projected into the compo...
Q107. What is the difference between the Options API and the Composition API in Vue 3?
The Options API organises component logic into fixed options such as data, methods, computed, watch and lifecycle hooks. The Composition API organises the same logic insi...
Q108. How do file permissions and chmod work?
Every file has permissions for owner, group and others, each with read (4), write (2) and execute (1). `chmod` changes them in symbolic or octal form. ```bash chmod 644 n...
Q109. What do attr_reader, attr_writer and attr_accessor do?
Ruby encapsulates instance variables such as `@name`, which are private by default. `attr_reader`, `attr_writer` and `attr_accessor` are class macros that define getter a...
Q110. What is the difference between let and var, and between structs and classes?
`let` declares a constant binding and `var` a mutable one. For value types, `let` also prevents changing stored properties. Structs are value types: assignment and passin...